What material is selected for the high frequency of the PCB?

What material is selected for the high frequency PCB?

The general frequency can be used FR-4 laminate, but high frequency materials should be used around 1-5G frequency, such as semi-ceramic materials, more commonly used are ROGERS 4350 series, 4003 series, 5880 series, etc....but If it is already higher than 5 G frequencies, it is best to use PTFE material, that is, polytetrafluoroethylene. This material has good high frequency performance, but the processing technology has limitations, such as surface processes that cannot be hot air leveling;